Roseview’s leading Ultimate Rose & Heritage Rose sash windows are now available with a certified U-value of 1.2 W/m2k, without the use of specialist glass such as triple or vacuum glazing.
This advance uses our new ThermoVFlex system, which is based upon patented technology developed by REHAU. ThermoVFlex centres on improving the window’s u-value through profile enhancements, rather than relying on specialist glass.
Until recently, reducing the u-value on sash windows below 1.4 W/m2k was only achievable with triple or vacuum glazing. Both options carry serious limitations, including cost, weight and practicality. For instance, most sash windows include astragal bars, which are not practically viable with triple or vacuum glazing.
ThermoVFlex allows us to manufacture Ultimate & Heritage Rose sash windows with a 1.2 u-value, while using the same IGUs that previously gave us 1.4 u-value.
The new optional upgrade is far more cost-effective than triple or vacuum glazing and overcomes all of their limitations. Best of all, visually ThermoVFlex has no effect whatsoever on the window, and doesn’t impose restrictions on the use of safety glass, patterns or astragal bars. Allowing you to design a sash window that is suitable for both refurbishment, conservation and new-build projects.
